Related Questions

The instruments which provide electromagnetic radiation of specified wave length or a band of wave lengths to illuminate the earth surface are called:
A Sensors
B Passive sensors
C Active sensors
D None of these
"An Electromagnetic wave falls on to a boundary between two losses less homogeneous media with different refractive indices, a part of the wave is reflected back to the incident medium and the rest is transmitted on to the second media". This phenomenon is known as:
A Fresnel reflection
B Fresnel refraction
C Snell's law
D None of these
If ‘Hs’ is the significant wave height, then the average wave height and highest wave height respectively are given by
A 0.6 Hs and 1.67 Hs
B 0.6 Hs and 1.87 Hs
C 1.27 Hs and 1.87 Hs
D 1.27 Hs and 1.67 Hs
Which one of the following is not an electromagnetic wave?
A Light wave
B Radio wave
C Sound wave
D Microwave
What is the purpose of the electromagnetic field which surrounds a traveling-wave tube?
A To accelerate the electron
B To velocity modulate the electron beam
C To keep the electrons from spreading out
D To slow down the signal on the helix
নিচের কোনটি তড়িচ্চুম্বক তরঙ্গ (Electromagnetic wave) নয়?
A অবলোহিত তরঙ্গ
B দৃশ্যমান আলো
C এক্সরে
D আলফা রশ্মি
The interaction of the electromagnetic radiation produced with a specific wave length to illuminate a target on the terrain for studying its scattered radiance, is called:
A Passive remote sensing
B Active remote sensing
C Neutral remote sensing
D None of these
The entire range of the electromagnetic spectrum spans a large spectrum of wave lengths varying from:
A 10-10 to 106 m
B 10-8 to 106 m
C 10-10 to 1010 m
D 10-8 to 108 m
When a wave is incident from the more dense into a less dense medium at an angle equal to or exceeding the critical angle, the wave suffers total internal __________ .
A Reflection
B Refraction
C Transmission
D None of the above
The wave in wave guide has
A Group velocity inversely proportional to wavelength
B Larger frequency than in the free space
C Diminishing wavelength than in the free space
D Larger wavelength than in the free space

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